impeller::FillRectGeometry Class Reference

#include <rect_geometry.h>

Inheritance diagram for impeller::FillRectGeometry:

Public Member Functions
	FillRectGeometry (Rect rect)
	~FillRectGeometry () override
const Rect &	GetRect () const
void	SetAntialiasPadding (Scalar padding)
Scalar	GetAntialiasPadding () const
bool	CoversArea (const Matrix &transform, const Rect &rect) const override
	Determines if this geometry, transformed by the given transform, will completely cover all surface area of the given rect. More...
bool	IsAxisAlignedRect () const override
GeometryResult	GetPositionBuffer (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
std::optional< Rect >	GetCoverage (const Matrix &transform) const override
Public Member Functions inherited from impeller::Geometry
virtual	~Geometry ()
virtual GeometryResult::Mode	GetResultMode () const
virtual bool	CanApplyMaskFilter () const
virtual Scalar	ComputeAlphaCoverage (const Matrix &transform) const

Additional Inherited Members
Static Public Member Functions inherited from impeller::Geometry
static std::unique_ptr< Geometry >	MakeFillPath (const flutter::DlPath &path, std::optional< Rect > inner_rect=std::nullopt)
static std::unique_ptr< Geometry >	MakeStrokePath (const flutter::DlPath &path, const StrokeParameters &stroke={})
static std::unique_ptr< Geometry >	MakeCover ()
static std::unique_ptr< Geometry >	MakeRect (const Rect &rect)
static std::unique_ptr< Geometry >	MakeOval (const Rect &rect)
static std::unique_ptr< Geometry >	MakeLine (const Point &p0, const Point &p1, const StrokeParameters &stroke)
static std::unique_ptr< Geometry >	MakeCircle (const Point &center, Scalar radius)
static std::unique_ptr< Geometry >	MakeStrokedCircle (const Point &center, Scalar radius, Scalar stroke_width)
static std::unique_ptr< Geometry >	MakeFilledArc (const Rect &oval_bounds, Degrees start, Degrees sweep, bool include_center)
static std::unique_ptr< Geometry >	MakeStrokedArc (const Rect &oval_bounds, Degrees start, Degrees sweep, const StrokeParameters &stroke)
static std::unique_ptr< Geometry >	MakeRoundRect (const Rect &rect, const Size &radii)
static std::unique_ptr< Geometry >	MakeRoundSuperellipse (const Rect &rect, Scalar corner_radius)
static Scalar	ComputeStrokeAlphaCoverage (const Matrix &entity, Scalar stroke_width)
	Compute an alpha value to simulate lower coverage of fractional pixel strokes. More...
static GeometryResult	ComputePositionGeometry (const ContentContext &renderer, const Tessellator::VertexGenerator &generator, const Entity &entity, RenderPass &pass)

Detailed Description

Definition at line 13 of file rect_geometry.h.

Constructor & Destructor Documentation

FillRectGeometry()

impeller::FillRectGeometry::FillRectGeometry ( Rect  rect )

explicit

Definition at line 9 of file rect_geometry.cc.

: rect_(rect) {}

~FillRectGeometry()

impeller::FillRectGeometry::~FillRectGeometry ( )

overridedefault

Member Function Documentation

CoversArea()

bool impeller::FillRectGeometry::CoversArea ( const Matrix &  transform, const Rect &  rect  ) const

overridevirtual

Determines if this geometry, transformed by the given transform, will completely cover all surface area of the given rect.

This is a conservative estimate useful for certain optimizations.

Returns

true if the transformed geometry is guaranteed to cover the given rect. May return false in many undetected cases where the transformed geometry does in fact cover the rect.

Reimplemented from impeller::Geometry.

Definition at line 55 of file rect_geometry.cc.

                                                          {
  if (!transform.IsTranslationScaleOnly()) {
    return false;
  }
  Rect coverage = rect_.TransformBounds(transform);
  return coverage.Contains(rect);
}

References impeller::TRect< T >::Contains(), transform, and impeller::TRect< T >::TransformBounds().

GetAntialiasPadding()

Scalar impeller::FillRectGeometry::GetAntialiasPadding

(

)

const

Definition at line 21 of file rect_geometry.cc.

                                                   {
  return padding_pixels_;
}

GetCoverage()

std::optional< Rect > impeller::FillRectGeometry::GetCoverage ( const Matrix &  transform ) const

overridevirtual

Implements impeller::Geometry.

Definition at line 48 of file rect_geometry.cc.

                                   {
  Scalar max_basis = transform.GetMaxBasisLengthXY();
  Scalar padding = max_basis == 0 ? 0 : padding_pixels_ / max_basis;
  return rect_.Expand(padding).TransformAndClipBounds(transform);
}

References impeller::TRect< T >::Expand(), padding, transform, and impeller::TRect< T >::TransformAndClipBounds().

Referenced by impeller::testing::TEST().

GetPositionBuffer()

GeometryResult impeller::FillRectGeometry::GetPositionBuffer ( const ContentContext &  renderer, const Entity &  entity, RenderPass &  pass  ) const

overridevirtual

Implements impeller::Geometry.

Definition at line 25 of file rect_geometry.cc.

                            {
  auto& data_host_buffer = renderer.GetTransientsDataBuffer();
  Scalar max_basis = entity.GetTransform().GetMaxBasisLengthXY();
  Scalar padding = max_basis == 0 ? 0 : padding_pixels_ / max_basis;
  Rect expanded_rect = rect_.Expand(padding);
  return GeometryResult{
      .type = PrimitiveType::kTriangleStrip,
      .vertex_buffer =
          {
              .vertex_buffer =
                  data_host_buffer.Emplace(expanded_rect.GetPoints().data(),
                                           8 * sizeof(float), alignof(float)),
              .vertex_count = 4,
              .index_type = IndexType::kNone,
          },
      .transform = entity.GetShaderTransform(pass),
      .mode = GeometryResult::Mode::kNormal,
  };
}

References impeller::TRect< T >::Expand(), impeller::Matrix::GetMaxBasisLengthXY(), impeller::TRect< T >::GetPoints(), impeller::Entity::GetShaderTransform(), impeller::Entity::GetTransform(), impeller::ContentContext::GetTransientsDataBuffer(), impeller::kNone, impeller::GeometryResult::kNormal, impeller::kTriangleStrip, padding, and impeller::GeometryResult::type.

GetRect()

const Rect & impeller::FillRectGeometry::GetRect

(

)

const

Definition at line 13 of file rect_geometry.cc.

                                            {
  return rect_;
}

Referenced by impeller::UberSDFContents::MakeRect().

IsAxisAlignedRect()

bool impeller::FillRectGeometry::IsAxisAlignedRect ( ) const

overridevirtual

Reimplemented from impeller::Geometry.

Definition at line 64 of file rect_geometry.cc.

                                               {
  return true;
}

SetAntialiasPadding()

void impeller::FillRectGeometry::SetAntialiasPadding

(

Scalar

padding

)

Definition at line 17 of file rect_geometry.cc.

                                                         {
  padding_pixels_ = padding;
}

References padding.

Referenced by impeller::Canvas::DrawRect(), and impeller::testing::TEST().

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The documentation for this class was generated from the following files:

• impeller/entity/geometry/rect_geometry.h
• impeller/entity/geometry/rect_geometry.cc